22121230221 has 16 divisors (see below), whose sum is σ = 32866651200. Its totient is φ = 14704980624.

The previous prime is 22121230207. The next prime is 22121230277. The reversal of 22121230221 is 12203212122.

22121230221 is a `hidden beast` number, since 2 + 212 + 1 + 230 + 221 = 666.

It is not a de Polignac number, because 22121230221 - 2⁹ = 22121229709 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 22121230194 and 22121230203.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (22121230921) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1171186 + ... + 1189923.

It is an arithmetic number, because the mean of its divisors is an integer number (2054165700).

Almost surely, 2^22121230221 is an apocalyptic number.

It is an amenable number.

22121230221 is a deficient number, since it is larger than the sum of its proper divisors (10745420979).

22121230221 is a wasteful number, since it uses less digits than its factorization.

22121230221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2361465 (or 2361459 counting only the distinct ones).

The product of its (nonzero) digits is 192, while the sum is 18.

Adding to 22121230221 its reverse (12203212122), we get a palindrome (34324442343).

The spelling of 22121230221 in words is "twenty-two billion, one hundred twenty-one million, two hundred thirty thousand, two hundred twenty-one".